feat: AI delivery pipeline (composites + CLI + validator + STABILITY contract)

[filippofilip95]

What

• 7 reusable stage composites for the AI delivery pipeline: wizrd-stage-{triage,plan,implement,review,fix,verify,doc-gardening}.yml + the deterministic wizrd-tagger.yml + shared wizrd-transition composite action. Label-driven cascade with gh workflow run chaining to bypass GitHub's labeled-event suppression for GITHUB_TOKEN.
• wizrd pipeline enable — one-command bootstrap for any L1/L2 repo: auto-detects repo/level/default-branch/docs-root/secret presence, seeds labels, sets OAuth secret, generates .github/workflows/wizrd-pipeline.yml, opens a PR. wizrd pipeline init exposes the low-level template render for tests + regeneration.
• Validator check 12 (pipeline adoption) + STABILITY.md (composite-surface contract — additive vs. breaking + deprecation plan for wizrd-agent.yml / wizrd-review.yml). seed-labels.sh always seeds wizrd:* labels at L1/L2.

Context

Plan: knowledge-base/strategy/2026-06-11-wizrd-pipeline-offroadmarket-pilot.md in the L0 wizrd repo. Patterns adopted from QualityUnit's harnext (closed-loop harness model from Viktor Zeman's Kodéra talk), re-expressed as hand-written workflow_call reusables in our existing wizrd-cli@v1 distribution channel so all ~20 Digitaliko repos pick up updates by ref. Pilot target: offroadmarket-web.

Quality

• Review: subagent-driven, all tasks approved (spec + code-quality pass per task).
• Tests: bun test packages/agent/src/commands/ — 11/11 pass.
• Gate: dispatch / harness — additive only on the composite surface (per STABILITY.md). Old composites untouched, marked deprecated for Phase G sunset.

Impact

• Client/project: enables the pipeline for any opt-in repo; the L0 PR (digitaliko-wizrd#TBD) wires up labels, rules, and /w-daily queue surface.
• Unblocks: Phase D pilot — wizrd pipeline enable in clients/offroadmarket/services/web/. After this merges, force-push v1 so consumers see the new composites.

Tag bump (after merge)

```
git tag -fa v1 -m "feat: pipeline composites + STABILITY.md"
git push --force-with-lease origin v1
```